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Definition of Theta rhythm
1. Noun. The normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude.
Definition of Theta rhythm
1. Noun. A type of electrical activity in the brain, brain waves with a frequency 4-8 hertz. ¹
¹ Source: wiktionary.com
Medical Definition of Theta rhythm
1. Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998)